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  1. Article ; Online: The Effects of Vitamin D on Immune System and Inflammatory Diseases.

    Ao, Tomoka / Kikuta, Junichi / Ishii, Masaru

    Biomolecules

    2021  Volume 11, Issue 11

    Abstract: Immune cells, including dendritic cells, macrophages, and T and B cells, express the vitamin D receptor and 1α-hydroxylase. In vitro studies have shown that 1,25-dihydroxyvitamin D, the active form of vitamin D, has an anti-inflammatory effect. Recent ... ...

    Abstract Immune cells, including dendritic cells, macrophages, and T and B cells, express the vitamin D receptor and 1α-hydroxylase. In vitro studies have shown that 1,25-dihydroxyvitamin D, the active form of vitamin D, has an anti-inflammatory effect. Recent epidemiological evidence has indicated a significant association between vitamin D deficiency and an increased incidence, or aggravation, of infectious diseases and inflammatory autoimmune diseases, such as rheumatoid arthritis, systemic lupus erythematosus, and multiple sclerosis. However, the impact of vitamin D on treatment and prevention, particularly in infectious diseases such as the 2019 coronavirus disease (COVID-19), remains controversial. Here, we review recent evidence associated with the relationship between vitamin D and inflammatory diseases and describe the underlying immunomodulatory effect of vitamin D.
    MeSH term(s) Animals ; Arthritis, Rheumatoid/drug therapy ; Arthritis, Rheumatoid/prevention & control ; Autoimmune Diseases/drug therapy ; B-Lymphocytes/immunology ; COVID-19/drug therapy ; COVID-19/prevention & control ; Dendritic Cells/immunology ; Disease Models, Animal ; Humans ; Immune System/drug effects ; Inflammation/drug therapy ; Influenza, Human/drug therapy ; Influenza, Human/prevention & control ; Lupus Erythematosus, Systemic/drug therapy ; Lupus Erythematosus, Systemic/prevention & control ; Macrophages/immunology ; Mice ; Monocytes/immunology ; Multiple Sclerosis/drug therapy ; Multiple Sclerosis/prevention & control ; Receptors, Calcitriol/genetics ; Receptors, Calcitriol/physiology ; T-Lymphocytes/immunology ; Vitamin D/therapeutic use ; Vitamin D Deficiency/complications
    Chemical Substances Receptors, Calcitriol ; VDR protein, human ; Vitamin D (1406-16-2)
    Language English
    Publishing date 2021-11-03
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2701262-1
    ISSN 2218-273X ; 2218-273X
    ISSN (online) 2218-273X
    ISSN 2218-273X
    DOI 10.3390/biom11111624
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Two Cases of Gouty Sacroiliitis Evaluated by Dual-energy Computed Tomography.

    Ao, Tomoka / Shoda, Hirofumi / Yamamoto, Kazuhiko

    The Journal of rheumatology

    2016  Volume 43, Issue 6, Page(s) 1146–1147

    Language English
    Publishing date 2016-06
    Publishing country Canada
    Document type Journal Article
    ZDB-ID 194928-7
    ISSN 1499-2752 ; 0315-162X
    ISSN (online) 1499-2752
    ISSN 0315-162X
    DOI 10.3899/jrheum.151454
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: [Update on recent progress in vitamin D research. The effects of vitamin D in autoinflammatory diseases.]

    Ao, Tomoka / Kikuta, Junichi / Ishii, Masaru

    Clinical calcium

    2017  Volume 27, Issue 11, Page(s) 1551–1559

    Abstract: Various kinds of immune cells -including dendritic cells, macrophages, T cells and B cells- express the vitamin D receptor and 1α-hydroxylase(CYP27B1). ...

    Abstract Various kinds of immune cells -including dendritic cells, macrophages, T cells and B cells- express the vitamin D receptor and 1α-hydroxylase(CYP27B1).
    Language Japanese
    Publishing date 2017
    Publishing country Japan
    Document type English Abstract ; Journal Article
    ZDB-ID 2386417-5
    ISSN 0917-5857
    ISSN 0917-5857
    DOI CliCa171115511559
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Local sympathetic neurons promote neutrophil egress from the bone marrow at the onset of acute inflammation.

    Ao, Tomoka / Kikuta, Junichi / Sudo, Takao / Uchida, Yutaka / Kobayashi, Kenta / Ishii, Masaru

    International immunology

    2020  Volume 32, Issue 11, Page(s) 727–736

    Abstract: The sympathetic nervous system plays critical roles in the differentiation, maturation and recruitment of immune cells under homeostatic conditions, and in responses to environmental stimuli, although its role in the migratory control of immune cells ... ...

    Abstract The sympathetic nervous system plays critical roles in the differentiation, maturation and recruitment of immune cells under homeostatic conditions, and in responses to environmental stimuli, although its role in the migratory control of immune cells during acute inflammation remains unclear. In this study, using an advanced intravital bone imaging system established in our laboratory, we demonstrated that the sympathetic nervous system locally regulates neutrophil egress from the bone marrow for mobilization to inflammatory foci. We found that sympathetic neurons were located close to blood vessels in the bone marrow cavity; moreover, upon lipopolysaccharide (LPS) administration, local sympathectomy delayed neutrophil egress from the bone marrow and increased the proportion of neutrophils that remained in place. We also showed that vascular endothelial cells produced C-X-C motif chemokine ligand 1 (CXCL1), which is responsible for neutrophil egress out of the bone marrow. Its expression was up-regulated during acute inflammation, and was suppressed by β-adrenergic receptor blockade, which was accompanied with inhibition of neutrophil egress into the systemic circulation. Furthermore, systemic β-adrenergic signaling blockade decreased the recruitment of neutrophils in the lung under conditions of acute systemic inflammation. Taken together, the results of this study first suggested a new regulatory system, wherein local sympathetic nervous activation promoted neutrophil egress by enhancing Cxcl1 expression in bone marrow endothelial cells in a β-adrenergic signaling-dependent manner, contributing to the recruitment of neutrophils at the onset of inflammation in vivo.
    MeSH term(s) Animals ; Bone Marrow/immunology ; Inflammation/immunology ; Male ; Mice ; Mice, Inbred C57BL ; Neurons/immunology ; Neutrophils/immunology
    Language English
    Publishing date 2020-04-25
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1013745-2
    ISSN 1460-2377 ; 0953-8178
    ISSN (online) 1460-2377
    ISSN 0953-8178
    DOI 10.1093/intimm/dxaa025
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Anti-Siglec-15 antibody suppresses bone resorption by inhibiting osteoclast multinucleation without attenuating bone formation.

    Tsukazaki, Hiroyuki / Kikuta, Junichi / Ao, Tomoka / Morimoto, Akito / Fukuda, Chie / Tsuda, Eisuke / Minoshima, Masafumi / Kikuchi, Kazuya / Kaito, Takashi / Ishii, Masaru

    Bone

    2021  Volume 152, Page(s) 116095

    Abstract: Anti-resorptive drugs are widely used for the treatment of osteoporosis, but excessive inhibition of osteoclastogenesis can suppress bone turnover and cause the deterioration of bone quality. Sialic acid-binding immunoglobulin-like lectin 15 (Siglec-15) ... ...

    Abstract Anti-resorptive drugs are widely used for the treatment of osteoporosis, but excessive inhibition of osteoclastogenesis can suppress bone turnover and cause the deterioration of bone quality. Sialic acid-binding immunoglobulin-like lectin 15 (Siglec-15) is a transmembrane protein expressed on osteoclast precursor cells and mature osteoclasts. Siglec-15 regulates proteins containing immunoreceptor tyrosine-based activation motif (ITAM) domains, which then induce nuclear factor of activated T-cells 1 (NFATc1), a master transcription factor of osteoclast differentiation. Anti-Siglec-15 antibody modulates ITAM signaling in osteoclast precursors and inhibits the maturation of osteoclasts in vitro. However, in situ pharmacological effects, particularly during postmenopausal osteoporosis, remain unclear. Here, we demonstrated that anti-Siglec-15 antibody treatment protected against ovariectomy-induced bone loss by specifically inhibiting the generation of multinucleated osteoclasts in vivo. Moreover, treatment with anti-Siglec-15 antibody maintained bone formation to a greater extent than with risedronate, the first-line treatment for osteoporosis. Intravital imaging revealed that anti-Siglec-15 antibody treatment did not cause a reduction in osteoclast motility, whereas osteoclast motility declined following risedronate treatment. We evaluated osteoclast activity using a pH-sensing probe and found that the bone resorptive ability of osteoclasts was lower following anti-Siglec-15 antibody treatment compared to after risedronate treatment. Our findings suggest that anti-Siglec-15 treatment may have potential as an anti-resorptive therapy for osteoporosis, which substantially inhibits the activity of osteoclasts while maintaining physiological bone coupling.
    MeSH term(s) Bone Resorption/drug therapy ; Bone and Bones ; Cell Differentiation ; Female ; Humans ; NFATC Transcription Factors ; Osteoclasts ; Osteogenesis ; RANK Ligand
    Chemical Substances NFATC Transcription Factors ; RANK Ligand
    Language English
    Publishing date 2021-07-01
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 632515-4
    ISSN 1873-2763 ; 8756-3282
    ISSN (online) 1873-2763
    ISSN 8756-3282
    DOI 10.1016/j.bone.2021.116095
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Osteoblast-derived vesicles induce a switch from bone-formation to bone-resorption in vivo

    Maki Uenaka / Erika Yamashita / Junichi Kikuta / Akito Morimoto / Tomoka Ao / Hiroki Mizuno / Masayuki Furuya / Tetsuo Hasegawa / Hiroyuki Tsukazaki / Takao Sudo / Keizo Nishikawa / Daisuke Okuzaki / Daisuke Motooka / Nobuyoshi Kosaka / Fuminori Sugihara / Thomas Boettger / Thomas Braun / Takahiro Ochiya / Masaru Ishii

    Nature Communications, Vol 13, Iss 1, Pp 1-

    2022  Volume 13

    Abstract: Bone remodeling involves a switch between bone formation and resorption, but the mechanisms is unclear. Here, the authors show that intercellular communication via extracellular vesicles secreted by mature osteoblasts is a key factor for the switching, ... ...

    Abstract Bone remodeling involves a switch between bone formation and resorption, but the mechanisms is unclear. Here, the authors show that intercellular communication via extracellular vesicles secreted by mature osteoblasts is a key factor for the switching, via a microRNA-mediated mechanism.
    Keywords Science ; Q
    Language English
    Publishing date 2022-02-01T00:00:00Z
    Publisher Nature Portfolio
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article ; Online: Thrombomodulin induces anti-inflammatory effects by inhibiting the rolling adhesion of leukocytes in vivo.

    Nishizawa, Shino / Kikuta, Junichi / Seno, Shigeto / Kajiki, Masahiro / Tsujita, Ryuichi / Mizuno, Hiroki / Sudo, Takao / Ao, Tomoka / Matsuda, Hideo / Ishii, Masaru

    Journal of pharmacological sciences

    2020  Volume 143, Issue 1, Page(s) 17–22

    Abstract: Thrombomodulin (TM) is an integral membrane protein expressed on the surface of vascular endothelial cells that suppresses blood coagulation. Recent studies have shown that TM exhibits anti-inflammatory effects by inhibiting leukocyte recruitment. ... ...

    Abstract Thrombomodulin (TM) is an integral membrane protein expressed on the surface of vascular endothelial cells that suppresses blood coagulation. Recent studies have shown that TM exhibits anti-inflammatory effects by inhibiting leukocyte recruitment. However, the actual modes of action of TM in vivo remain unclear. Here, we describe the pharmacological effects of recombinant human soluble TM (TM alfa) on leukocyte dynamics in living mice using intravital imaging techniques. Under control conditions, neutrophils exhibited three distinct types of adhesion behavior in vessels: 1) "non-adhesion", in which cells flowed without vessel adhesion; 2) "rolling adhesion", in which cells transiently interacted with the endothelium; and 3) "tight binding", in which cells bound strongly to the endothelial cells. Compared to control conditions, local lipopolysaccharide stimulation resulted in an increased frequency of rolling adhesion that was not homogeneously distributed on vessel walls but occurred at specific endothelial sites. Under inflammatory conditions, TM alfa, particularly the D1 domain which is a lectin-like region of TM, significantly decreased the frequency of rolling adhesion, but did not influence the number of tight bindings. This was the first study to demonstrate that TM alfa exerts anti-inflammatory effects by inhibiting rolling adhesion of neutrophils to vascular endothelial cells in living mice.
    MeSH term(s) Animals ; Anti-Inflammatory Agents ; Cell Adhesion ; Endothelium, Vascular/cytology ; Male ; Mice, Inbred C57BL ; Molecular Imaging/methods ; Neutrophils/physiology ; Recombinant Proteins/pharmacology ; Thrombomodulin/physiology
    Chemical Substances Anti-Inflammatory Agents ; Recombinant Proteins ; Thrombomodulin
    Language English
    Publishing date 2020-01-14
    Publishing country Japan
    Document type Journal Article
    ZDB-ID 2104264-0
    ISSN 1347-8648 ; 1347-8613
    ISSN (online) 1347-8648
    ISSN 1347-8613
    DOI 10.1016/j.jphs.2020.01.001
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  8. Article ; Online: Osteoblast-derived vesicles induce a switch from bone-formation to bone-resorption in vivo.

    Uenaka, Maki / Yamashita, Erika / Kikuta, Junichi / Morimoto, Akito / Ao, Tomoka / Mizuno, Hiroki / Furuya, Masayuki / Hasegawa, Tetsuo / Tsukazaki, Hiroyuki / Sudo, Takao / Nishikawa, Keizo / Okuzaki, Daisuke / Motooka, Daisuke / Kosaka, Nobuyoshi / Sugihara, Fuminori / Boettger, Thomas / Braun, Thomas / Ochiya, Takahiro / Ishii, Masaru

    Nature communications

    2022  Volume 13, Issue 1, Page(s) 1066

    Abstract: Bone metabolism is regulated by the cooperative activity between bone-forming osteoblasts and bone-resorbing osteoclasts. However, the mechanisms mediating the switch between the osteoblastic and osteoclastic phases have not been fully elucidated. Here, ... ...

    Abstract Bone metabolism is regulated by the cooperative activity between bone-forming osteoblasts and bone-resorbing osteoclasts. However, the mechanisms mediating the switch between the osteoblastic and osteoclastic phases have not been fully elucidated. Here, we identify a specific subset of mature osteoblast-derived extracellular vesicles that inhibit bone formation and enhance osteoclastogenesis. Intravital imaging reveals that mature osteoblasts secrete and capture extracellular vesicles, referred to as small osteoblast vesicles (SOVs). Co-culture experiments demonstrate that SOVs suppress osteoblast differentiation and enhance the expression of receptor activator of NF-κB ligand, thereby inducing osteoclast differentiation. We also elucidate that the SOV-enriched microRNA miR-143 inhibits Runt-related transcription factor 2, a master regulator of osteoblastogenesis, by targeting the mRNA expression of its dimerization partner, core-binding factor β. In summary, we identify SOVs as a mode of cell-to-cell communication, controlling the dynamic transition from bone-forming to bone-resorbing phases in vivo.
    MeSH term(s) Bone Resorption/metabolism ; Cell Differentiation ; Humans ; Osteoblasts/metabolism ; Osteoclasts/metabolism ; Osteogenesis/genetics ; RANK Ligand/metabolism ; Signal Transduction
    Chemical Substances RANK Ligand
    Language English
    Publishing date 2022-02-24
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-022-28673-2
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Group 2 innate lymphoid cells support hematopoietic recovery under stress conditions.

    Sudo, Takao / Motomura, Yasutaka / Okuzaki, Daisuke / Hasegawa, Tetsuo / Yokota, Takafumi / Kikuta, Junichi / Ao, Tomoka / Mizuno, Hiroki / Matsui, Takahiro / Motooka, Daisuke / Yoshizawa, Ryosuke / Nagasawa, Takashi / Kanakura, Yuzuru / Moro, Kazuyo / Ishii, Masaru

    The Journal of experimental medicine

    2021  Volume 218, Issue 5

    Abstract: The cell-cycle status of hematopoietic stem and progenitor cells (HSPCs) becomes activated following chemotherapy-induced stress, promoting bone marrow (BM) regeneration; however, the underlying molecular mechanism remains elusive. Here we show that BM- ... ...

    Abstract The cell-cycle status of hematopoietic stem and progenitor cells (HSPCs) becomes activated following chemotherapy-induced stress, promoting bone marrow (BM) regeneration; however, the underlying molecular mechanism remains elusive. Here we show that BM-resident group 2 innate lymphoid cells (ILC2s) support the recovery of HSPCs from 5-fluorouracil (5-FU)-induced stress by secreting granulocyte-macrophage colony-stimulating factor (GM-CSF). Mechanistically, IL-33 released from chemo-sensitive B cell progenitors activates MyD88-mediated secretion of GM-CSF in ILC2, suggesting the existence of a B cell-ILC2 axis for maintaining hematopoietic homeostasis. GM-CSF knockout mice treated with 5-FU showed severe loss of myeloid lineage cells, causing lethality, which was rescued by transferring BM ILC2s from wild-type mice. Further, the adoptive transfer of ILC2s to 5-FU-treated mice accelerates hematopoietic recovery, while the reduction of ILC2s results in the opposite effect. Thus, ILC2s may function by "sensing" the damaged BM spaces and subsequently support hematopoietic recovery under stress conditions.
    MeSH term(s) Animals ; Bone Marrow/drug effects ; Bone Marrow/metabolism ; Bone Marrow Cells/cytology ; Bone Marrow Cells/drug effects ; Bone Marrow Cells/metabolism ; Cells, Cultured ; Fluorouracil/pharmacology ; Gene Expression Profiling/methods ; Granulocyte-Macrophage Colony-Stimulating Factor/genetics ; Granulocyte-Macrophage Colony-Stimulating Factor/metabolism ; Hematopoietic Stem Cell Transplantation/methods ; Hematopoietic Stem Cells/cytology ; Hematopoietic Stem Cells/drug effects ; Hematopoietic Stem Cells/metabolism ; Immunity, Innate/drug effects ; Immunity, Innate/immunology ; Immunosuppressive Agents/pharmacology ; Lymphocytes/drug effects ; Lymphocytes/immunology ; Lymphocytes/metabolism ; Mice, Inbred C57BL ; Mice, Knockout ; Mice, Transgenic ; Microscopy, Confocal ; Reverse Transcriptase Polymerase Chain Reaction ; Mice
    Chemical Substances Immunosuppressive Agents ; Granulocyte-Macrophage Colony-Stimulating Factor (83869-56-1) ; Fluorouracil (U3P01618RT)
    Language English
    Publishing date 2021-03-05
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 218343-2
    ISSN 1540-9538 ; 0022-1007
    ISSN (online) 1540-9538
    ISSN 0022-1007
    DOI 10.1084/jem.20200817
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  10. Article ; Online: PGE2 induced in and released by dying cells functions as an inhibitory DAMP.

    Hangai, Sho / Ao, Tomoka / Kimura, Yoshitaka / Matsuki, Kosuke / Kawamura, Takeshi / Negishi, Hideo / Nishio, Junko / Kodama, Tatsuhiko / Taniguchi, Tadatsugu / Yanai, Hideyuki

    Proceedings of the National Academy of Sciences of the United States of America

    2016  Volume 113, Issue 14, Page(s) 3844–3849

    Abstract: Cellular components released into the external milieu as a result of cell death and sensed by the body are generally termed damage-associated molecular patterns (DAMPs). Although DAMPs are conventionally thought to be protective to the host by evoking ... ...

    Abstract Cellular components released into the external milieu as a result of cell death and sensed by the body are generally termed damage-associated molecular patterns (DAMPs). Although DAMPs are conventionally thought to be protective to the host by evoking inflammatory responses important for immunity and wound repair, there is the prevailing notion that dysregulated release of DAMPs can also underlie or exacerbate disease development. However, the critical issue for how resultant DAMP-mediated responses are regulated has heretofore not been fully addressed. In the present study, we identify prostaglandin E2 (PGE2) as a DAMP that negatively regulates immune responses. We show that the production of PGE2 is augmented under cell death-inducing conditions via the transcriptional induction of the cyclooxygenase 2 (COX2) gene and that cell-released PGE2 suppresses the expression of genes associated with inflammation, thereby limiting the cell's immunostimulatory activities. Consistent with this, inhibition of the PGE2 synthesis pathway potentiates the inflammation induced by dying cells. We also provide in vivo evidence for a protective role of PGE2 released upon acetaminophen-induced liver injury as well as a pathogenic role for PGE2 during tumor cell growth. Our study places this classically known lipid mediator in an unprecedented context-that is, an inhibitory DAMP vis-à-vis activating DAMPs, which may have translational implications for designing more effective therapeutic regimens for inflammation-associated diseases.
    MeSH term(s) Acetaminophen/adverse effects ; Alarmins/metabolism ; Animals ; Cell Death/immunology ; Cell Death/physiology ; Cell Line, Tumor ; Chemical and Drug Induced Liver Injury/immunology ; Cyclooxygenase 2/biosynthesis ; Dinoprostone/metabolism ; HeLa Cells ; Humans ; Inflammation/immunology ; Inflammation/pathology ; Lipopolysaccharides ; Mice ; Mice, Inbred C57BL
    Chemical Substances Alarmins ; Lipopolysaccharides ; Acetaminophen (362O9ITL9D) ; Ptgs2 protein, mouse (EC 1.14.99.-) ; Cyclooxygenase 2 (EC 1.14.99.1) ; Dinoprostone (K7Q1JQR04M)
    Language English
    Publishing date 2016-04-05
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 209104-5
    ISSN 1091-6490 ; 0027-8424
    ISSN (online) 1091-6490
    ISSN 0027-8424
    DOI 10.1073/pnas.1602023113
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